Dunwoody Water Hardness & Quality Report (2026)
Water Hardness
4.1 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
106 mg/L
Est. Daily Cost
$0.19
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Dunwoody, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Dunwoody | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Dunwoody compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Dunwoody, Georgia | 70.5 mg/L | 3.5 ppt | 🟡 Moderately Hard | reservoir |
| Sandy Springs, Georgia | 88 mg/L | 4.9 ppt | 🟡 Moderately Hard | reservoir |
| Chamblee, Georgia | 150 mg/L | 9.5 ppt | 🟠 Hard | reservoir |
| Roswell, Georgia | 124.5 mg/L | 7.6 ppt | 🟠 Hard | reservoir |
| Brookhaven, Georgia | 147.5 mg/L | 9.3 ppt | 🟠 Hard | reservoir |
National Benchmark
How Dunwoody compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Dunwoody | 70.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Dunwoody's Water Unique?
Local geology and source profile
Dunwoody, Georgia, in DeKalb County north of Atlanta — an affluent north Atlanta suburb (incorporated 2008), known as a corporate hub (State Farm Insurance, New York Life, and multiple Fortune 500 offices), a major Atlanta north perimeter community adjacent to Perimeter Mall and the I-285 Perimeter, and an affluent Jewish-American and South Asian-American community — draws its municipal water supply from the Chattahoochee River via the DeKalb County Watershed Management. Water hardness in Dunwoody measures 70.5 mg/L — classified as moderately soft.
Dunwoody's moderate softness — among the softest in the Atlanta metro area — reflects the Chattahoochee River supply characteristics in the north DeKalb County distribution zone. The Chattahoochee River above Atlanta drains the Georgia Blue Ridge Mountains (Dahlonega Gold Belt and Murphy Belt calcareous-poor granite and schist — a soft Appalachian crystalline watershed). The DeKalb County Watershed Management distribution in Dunwoody — a newer city with largely modern post-1960s distribution infrastructure — adds minimal accumulated hardness to the treated Chattahoochee supply, producing the moderate 70.5 mg/L at Dunwoody.
With hardness at 70.5 mg/L, Dunwoody residents enjoy moderately soft water for an Atlanta suburb. DeKalb County Watershed Management consistently delivers water meeting all Georgia EPD and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Chattahoochee River via the City of Atlanta Department of Watershed Management and the DeKalb County Watershed Management — the north DeKalb County Atlanta Piedmont corridor at the Chattahoochee River northeast Atlanta supply zone; moderately soft supply at 70.5 mg/L in DeKalb County.